diff options
| author | Jungseung Lee <js07.lee@samsung.com> | 2019-12-02 15:35:06 +0900 |
|---|---|---|
| committer | Tudor Ambarus <tudor.ambarus@microchip.com> | 2019-12-23 18:12:09 +0200 |
| commit | adf1092fa838e870813f2ac152973af311d8ae02 (patch) | |
| tree | a49e91e1247fb9ba6154ceb1613a45398fd08e07 /include/linux/mtd | |
| parent | 52487e21689b40c8ce967ba97518b3dfaaa2d7b2 (diff) | |
mtd: spi-nor: Support TB selection using SR bit 6
There are some flashes to use bit 6 of status register for Top/Bottom (TB).
Use top/bottom bit variable instead of fixed value and support this case.
Set the Top/Bottom (TB) mask based on SPI_NOR_TB_SR_BIT6 flash_info flag.
We can't use a bigger granularity, for example to set TB_BIT6 per
manufacturer using a SNOR_F flag. The manufacturers don't have a common
rule in regards to the TB bit:
Winbond : Use the 6th bit from 32MB capacity
W25Q20EW, W25Q50BW, W25Q128V - TB(5)
W25Q256JV, W25M512JV - TB(6)
GigaDevice : Use the 6th bit from 32MB capacity
GD25Q16C, GD25Q32C, GD25LQ32D, GD25Q64C, GD25Q128 - TB(5)
GD25Q256 - TB(6)
Micron/STM : Keep to use 5th bit
M25PX64, N25Q128A, N25Q512A, MT25QL512ABB, MT25QL02GCBB - TB(5)
Spansion : Use the 6th bit from 16MB capacity
S25FL116K, S25FL132K, S25FL165K - TB(5)
S25FL128L, S25FL256L - TB(6)
We can't make a correlation between TB and BP3 either, i.e. assume that if
BP3 is defined then TB will be at BIT(6). Micron breaks this rule.
Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
[tudor.ambarus@microchip.com: describe the reason for setting a
new flash_info flag.]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Diffstat (limited to 'include/linux/mtd')
| -rw-r--r-- | include/linux/mtd/spi-nor.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index 5124c306f60b..7e32adce72f7 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -245,6 +245,7 @@ enum spi_nor_option_flags { SNOR_F_HAS_LOCK = BIT(8), SNOR_F_HAS_16BIT_SR = BIT(9), SNOR_F_NO_READ_CR = BIT(10), + SNOR_F_HAS_SR_TB_BIT6 = BIT(11), }; |